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    题名 作者 年代 出处 被引量
1基于热模拟实验的富有机质泥页岩成岩作用及演化特征显示文摘富有机质泥页岩蕴含丰富的油气资源,但成岩研究基础薄弱,已成为制约页岩油气勘探开发进程的重要因素。通过开展成岩热模拟实验,结合扫描电镜观察、流体成分测试及有机酸测试等实验测试手段,全面描述实验过程中所发生的水—岩化学反应,试图揭示泥页岩成岩过程及成岩演化规律。研究结果显示,有机质热演化过程中存在一个较宽的有机酸生成窗口,对孔隙流体性质具有重要影响;长石和方解石存在接力溶蚀现象,长石溶蚀高峰过后紧接着出现方解石溶蚀高峰,但方解石溶蚀窗较窄,此后出现方解石重新沉淀结晶;黏土矿物转化及长石的溶蚀过程中会产生大量自生微晶石英,成链状或簇状胶结泥页岩骨架。泥页岩地层作为一个相对封闭体系,各类成岩作用之间相互关联,相互影响,构成错综复杂的成岩体系,进一步增加其成岩作用研究难度。栾国强 董春梅 马存飞 林承焰 张津营 吕夏霏 Muhammad Aleem Zahid 2016沉积学报2016,34,6:18
2铝-铜搅拌摩擦焊综述(英文)显示文摘在工程应用中需要通过连接不同的材料制成零部件以满足不同的要求。由于所用材料的力学、热和电性能存在巨大差异,使得这些零部件的制造极具挑战性。搅拌摩擦焊(FSW)能够用于连接异种材料,如铝(Al)和铜(Cu)。关于异种材料的连接,特别是铝-铜,文献来源比较分散,因此,铝-铜搅拌摩擦焊的信息收集比较繁琐。本文综述铝-铜的搅拌摩擦焊,为科研人员提供相关信息。文中全面涵盖和系统总结铝-铜搅拌摩擦焊的各项问题,如工具设计和尺寸、工艺参数以及流程对零件力学性能、微观组织和缺陷形成的影响。此外,还提出和探讨铝-铜搅拌摩擦焊的几个改进工艺。该工作不仅列举前人的主要成果,还提出铝-铜搅拌摩擦焊的发展建议。Nidhi SHARMA Zahid A.KHAN Arshad Noor SIDDIQUEE 2017Transactions of Nonferrous Metals Society of China2017,27,10:11
3Virological course of hepatitis A virus as determined by real time RT-PCR: Correlation with biochemical, immunological and genotypic profiles显示文摘瞄准:承担肝炎 A 的分析,并且相关病毒的负担,丙氨酸 aminotransferase (中高音) ,和有病毒血的持续时间的病毒的遗传型有控制调停房间的免疫的 CD4 (+)/ CD8 (+) 淋巴细胞人口的这些参数。方法:房间计数用用荧光在乙二胺四乙酸小瓶收集的新鲜全血被执行激活的房间 sorter。肝炎 A 病毒(HAV ) RNA 从血浆液被提取,抄录进 cDNA 并且由实时聚合酶链反应确定了并且是 genotyped 的颠倒。结果:在 11 个病人之中, 10 能完全被分析。这些, 3 有严重尖锐肝炎(s -- 啊) 并且剩余物有自我限制尖锐肝炎 A (啊哈) ,在第 4 d 上与有暴发性的疾病(脑病等级 IV ) 的一个病人一起死。中高音水平在啊哈两个都是显著地更高的(1070.9 +/- 894.3;P = 0.0014 ) 并且 s -- 啊(1713.9 +/- 886.3;P = 0.001 ) 与正常控制相比(23.6 +/- 7.2 ) 。在 s 的前凝血酶时间 -- 啊病人(21.0 +/- 2.0;P = 0.02 ) 比在啊哈显著地高(14.3 +/- 1.1;P = 0.44 ) 。在啊哈病人的 CD4 (+)/CD8 (+) 比率(1.17 +/- 0.11;P = 0.22 ) 并且 s -- 啊(0.83 +/- 0.12;P = 0.0002 ) 比在正常健康控制(1.52 ) 看低。有的自我限制盒子达到顶点在分析的开始的病毒的负担当时在 s -- 啊病人这发生在第 15 或第 30 d。在敏锐、严格的组,一耐心的各个属于遗传型 IA,与仍然是 8 个盒子属于遗传型 IIIA。唯一的暴发性的肝的失败大小写属于遗传型 IA。在自我限制感染的全部功课期间收集的 HAV 病毒的负担和中高音价值直接为 s 被相关,但是这不是事实 -- 啊病人。结论:基于小规模的研究, s 的固执地更高的病毒的负担 -- 啊可能由于减少的细胞免疫和溶血。病毒血的持续时间依赖于主人,当病毒的遗传型没在 AVH 和 s 的临床的结果有明显的角色 -- 啊盒子。Zahid Hussain Bhudev C Das Syed A Husain Sunil K Polipalli Tanzeel Ahmed Nargis Begum Subhash Medhi Alice Verghese Mohammad Raish Apiradee Theamboonlers Yong Poovorawan Premashis Kar 2006World Journal of Gastroenterology2006,12,29:10
4Design and Implementation of Cloud Platform for Intelligent Logistics in the Trend of Intellectualization显示文摘Intellectualization has become a new trend for telecom industry, driven by intelligent technology including cloud computing, big data, and Internet of things. In order to satisfy the service demand of intelligent logistics, this paper designed an intelligent logistics platform containing the main applications such as e-commerce, self-service transceiver, big data analysis, path location and distribution optimization. The intelligent logistics service platform has been built based on cloud computing to collect, store and handling multi-source heterogeneous mass data from sensors, RFID electronic tag, vehicle terminals and APP, so that the open-access cloud services including distribution, positioning, navigation, scheduling and other data services can be provided for the logistics distribution applications. And then the architecture of intelligent logistics cloud platform containing software layer(SaaS), platform layer(PaaS) and infrastructure(IaaS) has been constructed accordance with the core technology relative high concurrent processing technique, heterogeneous terminal data access, encapsulation and data mining. Therefore, intelligent logistics cloud platform can be carried out by the service mode for implementation to accelerate the construction of the symbiotic win-winlogistics ecological system and the benign development of the ICT industry in the trend of intellectualization in China.Mengke Yang Movahedipour Mahmood Xiaoguang Zhou Salam Shafaq Latif Zahid 2017China Communications2017,14,10:9
5Is there an association between Helicobacter pylori in the inlet patch and globus sensation?显示文摘AIM:To determine the association between Helicobacter pylori(H.pylori)and globus sensation(GS)in the patients with cervical inlet patch. METHODS:Sixty-eight patients with esophageal inlet patches were identified from 6760 consecutive patients undergoing upper gastrointestinal endoscopy prospectively.In these 68 patients with cervical inlet patches, symptoms of globus sensation(lump in the throat), hoarseness,sore throat,frequent clearing of the throat,cough,dysphagia,odynophagia of at least 3 mo duration was questioned prior to endoscopy. RESULTS:Cervical heterotopic gastric mucosa(CHGM) was found in 68 of 6760 patients.The endoscopic prevalence of CHGM was determined to be 1%.H.pylori was identified in 16(23.5%)of 68 patients with inlet patch.53 patients were classified as CHGMⅡ.This group included 48 patients with globus sensation,4 patients with chronic cough and 1 patient with hoarseness.All the patients who were H.pylori(+)in cervical inlet patches had globus sensation.CONCLUSION:Often patients with CHGM have a long history of troublesome throat symptoms.We speculate that disturbances in globus sensation are like non-ulcer dyspepsia.Hakan Alagozlu Zahide Simsek Selahattin Unal Mehmet Cindoruk Sukru Dumlu Ayse Dursun 2010World Journal of Gastroenterology2010,16,1:8
6Treatment of hemorrhoids: A survey of surgical practice in Australia and New Zealand显示文摘BACKGROUND Hemorrhoidal disease is the most common anorectal disorder.Hemorrhoids can be classified as external or internal,according to their relation to the dentate line.External hemorrhoids originate below the dentate line and are managed conservatively unless the patient cannot keep the perianal region clean,or they cause significant discomfort.Internal hemorrhoids originate above the dentate line and can be managed according to the graded degree of prolapse,as described by Goligher.Generally,low-grade internal hemorrhoids are effectively treated conservatively,by non-operative measures,while high-grade internal hemorrhoids warrant procedural intervention.AIM To determine the application of clinical practice guidelines for the current management of hemorrhoids and colorectal surgeon consensus in Australia and New Zealand.METHODS An online survey was distributed to 206 colorectal surgeons in Australia and New Zealand using 17 guideline-based hypothetical clinical scenarios.RESULTS There were 82 respondents(40%)to 17 guideline-based scenarios.Nine(53%)reached consensus,of which only 1(6%)disagreed with the guidelines.This was based on low quality evidence for the management of acutely thrombosed external hemorrhoids.There were 8 scenarios which showed community equipoise(47%)and they were equally divided for agreeing or disagreeing with the guidelines.These topics were based on low and moderate levels of evidence.They included the initial management of grade I internal hemorrhoids,grade III internal hemorrhoids when initial management had failed and the patient had recognised risks factors for septic complications;and finally,the decision-making when considering patient preferences,including a prompt return to work,or minimal post-operative pain.CONCLUSION Although there are areas of consensus in the management of hemorrhoids,there are many areas of community equipoise which would benefit from further research.George E Fowler Javariah Siddiqui Assad Zahid Christopher John Young 2019World Journal of Clinical Cases2019,7,22:8
7Eurycoma Longifolia as a potential adoptogen of male sexual health: a systematic review on clinical studies显示文摘Eurycoma longifolia(EL) has been well recognized as a booster of male sexual health. Over the past few decades, numerous in vivo animal studies and human clinical trials have been conducted across the globe to explore the promising role of EL in managing various male sexual disorders, which include erectile dysfunction, male infertility, low libido, and downregulated testosterone levels. The aim of the present review is to analyze and summarize the literature on human clinical trials which revealed the clinical significance and therapeutic feasibility of EL in improving male sexual health. This systematic review is focused on the following databases: Medline, Wiley Online Library, Bio Med Central, Hindawi, Web of Knowledge, Pub Med Central and Google Scholar, using search terms such as 'Eurycoma longifolia', 'EL', 'Tongkat Ali', 'male sexual health', 'sexual infertility', 'erectile dysfunction', 'male libido', and 'testosterone levels'. Notably, only human clinical studies published between 2000 and 2014 were selected and thoroughly reviewed for relevant citations. Out of 150 articles, 11 met the inclusion criteria. The majority of articles included were randomized placebo-controlled trials, multiple cohort studies, or pilot trials. All these studies demonstrated considerable effects of EL on male sexual health disorders. Among them, 7 studies revealed remarkable association between the use of EL and the efficacy in the treatment of male sexual disorders, and remaining 4 studies failed to demonstrate sufficient effects on male sexual health. In summary, there is convincing evidence for the prominence of EL in improving the male sexual health. The review also substantiates the use of current methodology in the development of novel and more rationale natural herbal medicines for the management of male sexual disorders.Hnin Ei Thu Isa Naina Mohamed Zahid Hussain Putri Ayu Jayusman Ahmad Nazrun Shuid 2017Chinese Journal of Natural Medicines2017,15,1:7
8Adjuvant effects of saponins on animal immune responses显示文摘Vaccines require optimal adjuvants including immunopotentiator and delivery systems to offer long term protection from infectious diseases in animals and man. Initially it was believed that adjuvants are responsible for promoting strong and sustainable antibody responses. Now it has been shown that adjuvants influence the isotype and avidity of antibody and also affect the properties of cell-mediated immunity. Mostly oil emulsions, lipopolysaccharides, polymers, saponins, liposomes, cytokines, ISCOMs (immunostimulating complexes), Freund’s complete adjuvant, Freund’s incomplete adjuvant, alums, bacterial toxins etc., are common adjuvants under investigation. Saponin based adjuvants have the ability to stimulate the cell mediated immune system as well as to enhance antibody production and have the advantage that only a low dose is needed for adjuvant activity. In the present study the importance of adjuvants, their role and the effect of saponin in immune system is reviewed.RAJPUT Zahid Iqbal ARIJO Abdullah G. 2007Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)2007,8,3:7
9中国某高校留学生跨文化适应压力及其心理因素(英文)显示文摘目的调查留学生跨文化适应压力的检出率及其相关因素。同时了解留学生的生理、心理因素与社会适应及中国文化之间的相互作用。方法采用抑郁焦虑压力量表、修订版社会文化适应量表和留学生版跨文化适应量表调查某高校共100名来自9个不同国家的留学生。结果调查结果显示32%的留学生存在跨文化适应压力问题,排前两位的适应问题分别是思念家乡和饮食问题。同时,留学生也存在压力、抑郁和焦虑等心理问题,不同年级留学生的压力问题发生率分别为:大一9.6%、大二37.5%、大三10.6%、大四25%、大五25%。抑郁症状发生率分别为:大一28.6%、大二12.5%、大三5%、大四40%和大五31.2%。焦虑症状发生率分别为:大一52.3%、大二37.5%、大三12.1%、大四30%和大五28.1%。社会文化适应第一位障碍是语言问题,其次是留学生在中国文化下保留自己的风俗习惯和个人兴趣的问题。结论留学生的适应问题突出,高校有必要加强引导和制定相关政策,以便留学生更好的适应中国文化。Muhammad Zahid abbas 梁雪梅 刘可智 2014四川精神卫生2014,27,2:6
10The Role of Synapsins in Neurological Disorders显示文摘Synapsins serve as flagships among the presynaptic proteins due to their abundance on synaptic vesicles and contribution to synaptic communication. Several studies have emphasized the importance of this multi-gene family of neuron-specific phosphoproteins in maintaining brain physiology. In the recent times, increasing evidence has established the relevance of alterations in synapsins as a major determinant in many neurological disorders. Here,we give a comprehensive description of the diverse roles of the synapsin family and the underlying molecular mechanisms that contribute to several neurological disorders.These physiologically important roles of synapsins associated with neurological disorders are just beginning to be understood. A detailed understanding of the diversified expression of synapsins may serve to strategize novel therapeutic approaches for these debilitating neurological disorders.Fatima Javed Mirza Saadia Zahid 2018Neuroscience Bulletin2018,34,2:6
11Reflectometric and interferometric fiber optic sensor's principles and applications显示文摘Fiber optic sensors have been widely used and studied in recent times. This paper presents operating principles and applications of fiber optic sensors namely reflectometric and interferometric fiber optic sensors. Majority of optical fiber sensors fall under these two broad categories. Both interferometric and reflectometric fiber optic sensors are becoming popular for their ease of use, flexibility, long distance sensing, and potentially noise free detection. Also, these sensors can easily be used in various applications such as structural health monitoring, perimeter intrusion detection, temperature monitoring, and other numerous applications. This paper broadly classifies fiber optic sensors into two subtypes. The paper further highlights different sensors based on their sensing resolution, range, spatial advantages, and applications.Muhammad Noaman ZAHID Jianliang JIANG Saad RIZVI 2019Frontiers of Optoelectronics2019,12,2:6
12Big Data Analytics in Telecommunications: Literature Review and Architecture Recommendations显示文摘This paper focuses on facilitating state-of-the-art applications of big data analytics(BDA) architectures and infrastructures to telecommunications(telecom) industrial sector.Telecom companies are dealing with terabytes to petabytes of data on a daily basis. Io T applications in telecom are further contributing to this data deluge. Recent advances in BDA have exposed new opportunities to get actionable insights from telecom big data. These benefits and the fast-changing BDA technology landscape make it important to investigate existing BDA applications to telecom sector. For this, we initially determine published research on BDA applications to telecom through a systematic literature review through which we filter 38 articles and categorize them in frameworks, use cases, literature reviews, white papers and experimental validations. We also discuss the benefits and challenges mentioned in these articles. We find that experiments are all proof of concepts(POC) on a severely limited BDA technology stack(as compared to the available technology stack), i.e.,we did not find any work focusing on full-fledged BDA implementation in an operational telecom environment. To facilitate these applications at research-level, we propose a state-of-the-art lambda architecture for BDA pipeline implementation(called Lambda Tel) based completely on open source BDA technologies and the standard Python language, along with relevant guidelines.We discovered only one research paper which presented a relatively-limited lambda architecture using the proprietary AWS cloud infrastructure. We believe Lambda Tel presents a clear roadmap for telecom industry practitioners to implement and enhance BDA applications in their enterprises.Hira Zahid Tariq Mahmood Ahsan Morshed Timos Sellis 2020IEEE/CAA Journal of Automatica Sinica2020,7,1:6
13Effectiveness of breathing exercises during the second stage of labor on labor pain and duration: a randomized controlled trial显示文摘BACKGROUND: Some research exists on the effect of non-pharmacological approaches for labor pain relief. However, there is limited information about effectiveness of breathing exercises in pregnant women to reduce maternal pain during labor.OBJECTIVE: To determine whether breathing exercises for pregnant women during the second stage of labor have beneficial effects on maternal pain, duration of labor, and the first-minute Appearance, Pulse, Grimace, Activity and Respiration(APGAR) scores. DESIGN, SETTING, PARTICIPANTS AND INTERVENTIONS: This randomized clinical trial involved 250 pregnant women, who were randomly divided into two groups: intervention group(IG; n = 125) and control group(CG; n = 125). IG received one session breathing exercise training and performed breathing exercises during the second stage of labor versus the CG that did not receive any breathing exercise training.MAIN OUTCOME MEASURES: The effects of breathing exercises on maternal pain were determined by Visual Analogue Scale(VAS), duration of the second stage of labor, and the first-minute APGAR scores.RESULTS: The mean age of the participants was(23.2 ± 4.2)(range: 18 to 42) years. Both IG and CG had similar baseline characteristics in terms of age, education level, occupation, and smoking(P > 0.05). The mean VAS scores of IG and CG were(88.2 ± 6.3) and(90.5 ± 7.0), respectively(P < 0.001). The duration of the second stage of labor was(369.6 ± 92.0) s for IG and(440.7 ± 142.5) s for CG(P < 0.001). The mean first-minute APGAR scores were(8.84 ± 0.50) for IG and(8.73 ± 0.89) for CG(P > 0.05).CONCLUSION: Based on this study, breathing exercises with deep inhalation and exhalation in pregnant women are effective in reducing the perception of labor pain and shortening the duration of the second stage of delivery. Therefore, we recommend breathing exercises as an effective modality for labor pain management and shortening the duration of labor.TRIAL REGISTRATION: This study is registered on the website of ClinicalT rials.gov(www.clinicaltrials.gov) with the number of NCT03066973.hilal yuksel yasemin cayir zahide kosan kenan tastan 2017Journal of Integrative Medicine2017,15,6:6
14High spatial and temporal resolution synthetic aperture phase microscopy显示文摘A new optical microscopy technique,termed high spatial and temporal resolution synthetic aperture phase microscopy(HISTR-SAPM),is proposed to improve the lateral resolution of wide-field coherent imaging.Under plane wave illumination,the resolution is increased by twofold to around 260 nm,while achieving millisecond-level temporal resolution.In HISTR-SAPM,digital micromirror devices are used to actively change the sample illumination beam angle at high speed with high stability.An off-axis interferometer is used to measure the sample scattered complex fields,which are then processed to reconstruct high-resolution phase images.Using HISTR-SAPM,we are able to map the height profiles of subwavelength photonic structures and resolve the period structures that have 198 nm linewidth and 132 nm gap(i.e.,a full pitch of 330 nm).As the reconstruction averages out laser speckle noise while maintaining high temporal resolution,HISTR-SAPM further enables imaging and quantification of nanoscale dynamics of live cells,such as red blood cell membrane fluctuations and subcellular structure dynamics within nucleated cells.We envision that HISTR-SAPM will broadly benefit research in material science and biology.Cheng Zheng Di Jin Yanping He Hongtao Lin Juejun Hu Zahid Yaqoo Peter T.C.So Renjie Zhou 2020Advanced Photonics2020,2,6:5
15搅拌摩擦焊清洁制造工艺过程中的缺陷分析(英文)显示文摘清洁生产是制造工艺过程中追求的目标。搅拌摩擦焊是一种比目前最好的传统焊接工艺更好、对环境损害更低的连接技术。搅拌摩擦焊工艺的能量效率高、无耗材、无损耗、无辐射。因此,它是一种能获得优质焊接接头的清洁焊接工艺。但它在焊接过程中会产生缺陷,为使其成为一种可靠的生产工艺,需要对其进行进一步优化。本文作者对搅拌摩擦焊接头的缺陷进行表征。结果表明,缺陷的产生是由于焊件过程的产生的热量不够、搅拌针附近的物质移动不充分、搅拌针后部的材料致密化不够。焊接过程中产生的热量和物料的搅拌程度取决于搅拌摩擦焊的焊接参数。焊接参数选择不当,可导致缺陷的产生。本文所得结果来源于文献和实验。根据各种缺陷的特征,如其可能产生的位置、减少缺陷产生的主要参数等,提出了减少缺陷产生的一些措施。Noor Zaman KHAN Zahid A.KHAN Arshad Noor SIDDIQUEE Abdulrahman M.AL-AHMARI Mustufa H.ABIDI 2017Transactions of Nonferrous Metals Society of China2017,27,7:4
16Behavioral interventions to eliminate fear responses显示文摘Fear memory underlies anxiety-related disorders, including posttraumatic stress disorder(PTSD). PTSD is a fear-based disorder,characterized by difficulties in extinguishing the learned fear response and maintaining extinction. Currently, the first-line treatment for PTSD is exposure therapy, which forms an extinction memory to compete with the original fear memory. However,the extinguished fear often returns under numerous circumstances, suggesting that novel methods are needed to eliminate fear memory or facilitate extinction memory. This review discusses research that targeted extinction and reconsolidation to manipulate fear memory. Recent studies indicate that sleep is an active state that can regulate memory processes. We also discuss the influence of sleep on fear memory. For each manipulation, we briefly summarize the neural mechanisms that have been identified in human studies. Finally, we highlight potential limitations and future directions in the field to better translate existing interventions to clinical settings.Jingli Yue Le Shi Xiao Lin Muhammad Zahid Khan Jie Shi Lin Lu 2018Science China(Life Sciences)2018,61,6:4
17慢性腰背痛患者的大脑灰质异常:基于体素的形态测量学分析显示文摘目的探讨慢性腰背痛患者大脑灰质的形态学变化。方法选择30例慢性腰背痛患者和30例健康志愿者,行3.0T磁共振扫描,获得高分辨T1结构像数据并用FMRIB软件库中的基于体素的形态学分析方法进行数据处理和统计学分析,获得疼痛组和健康组之间大脑灰质的形态学差异信息。结果与健康志愿者相比较,慢性腰背痛患者大脑皮层多个脑区灰质体积减少,包括双侧额上回、右侧额极、左侧岛叶、左侧颞下回及左侧颞中回(P<0.05,TFCE校正后);皮层下多个灰质核团体积增加,包括左侧丘脑、双侧壳核、双侧伏隔核、右侧尾状核(P<0.05,TFCE校正后)。结论慢性腰背痛患者大脑皮层和皮层下灰质存在不同的改变模式,这种变化可能与大脑对慢性疼痛的适应不良有关。毛翠平 杨全新 唐鉴 杨花娟 白芝兰 张秋娟 Zahid Nadeem 2016南方医科大学学报2016,36,8:4
18Subcellular spatial resolution achieved for deep-brain imaging in vivo using a minimally invasive multimode fiber显示文摘Achieving intravital optical imaging with diffraction-limited spatial resolution of deep-brain structures represents an important step toward the goal of understanding the mammalian central nervous system1–4.Advances in wavefrontshaping methods and computational power have recently allowed for a novel approach to high-resolution imaging,utilizing deterministic light propagation through optically complex media and,of particular importance for this work,multimode optical fibers(MMFs)5–7.We report a compact and highly optimized approach for minimally invasive in vivo brain imaging applications.The volume of tissue lesion was reduced by more than 100-fold,while preserving diffraction-limited imaging performance utilizing wavefront control of light propagation through a single 50-μm-core MMF.Here,we demonstrated high-resolution fluorescence imaging of subcellular neuronal structures,dendrites and synaptic specializations,in deep-brain regions of living mice,as well as monitored stimulus-driven functional Ca2+responses.These results represent a major breakthrough in the compromise between high-resolution imaging and tissue damage,heralding new possibilities for deep-brain imaging in vivo.Sebastian A.Vasquez-Lopez Raphaël Turcotte Vadim Koren Martin Plöschner Zahid Padamsey Martin J.Booth TomášČižmár Nigel J.Emptage 2018Light(Science & Applications)2018,7,1:4
192型糖尿病患者大脑后扣带回谷氨酸代谢的磁共振波谱研究显示文摘目的 探讨2型糖尿病(T2DM)患者大脑后扣带回谷氨酸代谢变化及其与血糖的关系,以了解糖尿病脑病病理生理变化的物质基础。方法 连续收集15例T2DM患者和10例健康志愿者,采用TE-averaged PRESS序列行MRS检查,比较2组间大脑后扣带回谷氨酸(Glu)、N-乙酰天门冬氨酸( NAA)、乙酰胆碱(Cho)和肌酸(Cr)水平差异,分析代谢物与血糖水平之间的关系。结果 与对照组相比,T2DM组大脑后扣带回Cho(P=0.02)及Glu(P〈0.01)含量显著升高,NAA含量显著降低(P=0.03),而Cr在2组间无显著差异(P>0.05)。在对照组和T2DM组,糖化血红蛋白(HbA1c)与Glu之间呈显著正相关(r=0.692,P=0.000),而糖化血红蛋白与NAA呈显著的负相关(r=-0.628,P=0.001)。结论 采用TE-averaged PRESS序列可测定T2DM患者大脑后扣带回脑区代谢物水平的变化,尤其是可以独立测量Glu含量,并发现Glu升高和NAA下降与高血糖有关。张秋娟 戴晓庆 宫琰 白芝兰 李小会 ZAHID NADEEM 何娜 2016实用放射学杂志2016,32,9:4
20Improvement of a High Velocity Compaction Technique for Iron Powder显示文摘Water atomized pure iron powder was compacted by high velocity compaction(HVC) with and without upper relaxation assist(URA) device.The influence of URA device on green density,spring back,green strength and hardness was studied.Morphological characteristics of the samples were observed by scanning electron microscope(SEM).Green strength of the samples was measured by computer controlled universal testing machine.The results show that as stroke length increases,the green density,green strength and hardness of the compacts increase gradually.At the identical stroke length,the green density of the compacts pressed with URA devise was 2% higher than the compacts pressed without URA device.The green strength and hardness of the compacts pressed with URA device were higher than the compacts pressed without URA device.Furthermore,the radial spring back of the compacts decreased gradually with the increment in stroke length,whilst that of compacts prepared with URA device was lower.Dil Faraz KHAN Haiqing YIN Zahid USMAN Matiullah KHAN Xianjie YUAN Wenhao WANG Xuanhui QU 2013Acta Metallurgica Sinica(English Letters)2013,26,4:4
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